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93civicvx · 04-22-2011, 02:51 PM

Hello,

Is it necessary to reset the ECU when installing a new O2 sensor ?
I took my '93 VX to Honda to inquire about it running crappy and they stated I needed a new O2 - to the tune of $541 !!

They said to disconnect the O2 for the time being, so I did and it runs GREAT !
With the O2 plugged in ( NO CEL ), I get 35 mpg, with it disconnected ( CEL present ), I get 42 - 46 mpg !!

I performed a continuity check of ALL the O2 wires from the plug in the engine bay to the ECU pins - ALL check good...

So, after much research, I bought one for $159 off ebay ( 1992 - 2001 HONDA CIVIC O2 OXYGEN SENSOR FRONT | eBay ).

Upon installation, it behaved the same as the old O2, so... I was wondering, is it necessary to reset the O2 ?

04-22-2011, 02:51 PM	#6 (permalink)
93civicvx EcoModding Lurker Join Date: Dec 2010 Location: Brevard, FL Posts: 39 93civicvx - '93 Honda Civic VX Team Honda 90 day: 52.33 mpg (US) Thanks: 2 Thanked 6 Times in 4 Posts	Hello, Is it necessary to reset the ECU when installing a new O2 sensor ? I took my '93 VX to Honda to inquire about it running crappy and they stated I needed a new O2 - to the tune of $541 !! They said to disconnect the O2 for the time being, so I did and it runs GREAT ! With the O2 plugged in ( NO CEL ), I get 35 mpg, with it disconnected ( CEL present ), I get 42 - 46 mpg !! I performed a continuity check of ALL the O2 wires from the plug in the engine bay to the ECU pins - ALL check good... So, after much research, I bought one for $159 off ebay ( 1992 - 2001 HONDA CIVIC O2 OXYGEN SENSOR FRONT \| eBay ). Upon installation, it behaved the same as the old O2, so... I was wondering, is it necessary to reset the O2 ?